Calculating machine



June 13, 1933. cz 1,913,510

CALCULATING MACHINE Filed May 4, 1951 4 Sheets-Sheet l IJNVENTOR BYEmesf Pacz do; AW, (9% WW ATTORNEYS June 13, 1933. cz 1,913,510

' MACHINE Filed May 4, 1931 4 Sheets-Sheet 2 INVENTOR Ernesf BaezATTORNEYS June 13, 1933. R 1,913,510

CALCULATING MACHINE Filed May 4, 1931 4 Sheets-Sheet 3 Eig.4. 4

INVENTOR Emeaf Baez BY 0, 144%, 03%, y/MM ATTORNEYS June 13, 1933. E.RACZ ,9 3

CALCULATING MACHINE Filed May 4, 1931 4 Sheets-Sheet 4 INVENTOR Emeaf Facz ATTORNEYS Patented June 13, 1933 UNITED STATES PATENT OFFICE ERNESTRACZ, OF DETROIT, MICHIGAN, ASSIGNOR 'IO BURROUGHS ADDING MACHINECOMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN CALCULATINGMACHINE Application filed May 4, 1931. Serial No. 534,725.

This invention relates to a calculating machine. It relates particularlyto a feature which, for trade convenience, has been termed an enforceddesignation feature,

that is, before the operator can operate the machine, he is compelled tocondition it so that it will print certain designations indicating thecharacter of the item or transaction that is recorded.

In certain uses of a calculating machine such, for example, as in aservice station, the attendant is required to enter each item purchasedby a customer. A record of these items is retained in the machine forthe use of the proprietor who may wish to examine the record of a daysbusiness. It is often desirable that a designation mark be printedadjacent each item showing the class of goods sold, for example, oil,gas, tires, etc. A special row of designation keys is provided for usein printing these designations, but it is a very easy matter for theattendant to forget to press the designation keys and, by the end of theday, he will often forget the character of the items sold.

The present invention is directed to a solution of this problem and itcomprehends the provision of an improved mechanism for preventing properoperation of the machine unless a designation key is depressed.Provision is also made for freeing the machine for operation when atotal is to be taken without requiring depression of a designation key.There is a further provision for enabling the proprietor to disable thedos ignation feature so that the machine may be used for ordinarycalculations without employing the designation keys. In another species,the designation is printed only when a total is taken.

The object of the invention is to provide an improved mechanism forcompelling the operator of a calculating machine to condition themachine to cause it to print a designating character before he canproperly operate the machine. 4

A more particular object is to provide, in a machine of this character,mechanism that will automatically disconnect the driving means from theoperating mechanism of the machine when a designating key has not beendepressed under predetermined conditions.

A further object is to provide, in a machine of this character, amechanism that will automatically free the machine for the taking of atotal without requiring the depression of a designation key.

A further object is to provide a means under the control of theproprietor for changing the character of the machine by disabling theenforced designation feature.

Other and more s ecific objects of the invention will appear rom thefollowing specification and drawings.

An embodiment of the invention is shown in the accompanying drawings inwhich:

Figure 1 is a eft side elevation of a machine with the invention appliedthereto, the casing of the machine and certain parts being omitted toshow others more clearly, the parts being in normal positions.

Fig. 2 is a partial erspective of one of the designation keys showingthe slides associated with it.

Fig. 3 is a partial plan view of the keyboard showing the designationkeys on the left hand side and the control keys on the right hand side.

Fig. 4 is a partial right side elevation of the machine showing thepertinent mechanism in normal condition.

Fig. 5 is a partial sectional plan view showing a locking means by whichthe roprietor may disable the enforced identi cation feature.

Fig. 6 is a section on the line 6-6 of Fig. 4.

Fig. 7 is a partial plan view similar to Fig. 5 with the locking meansin unlocked position.

Fig. 8 is a partial left side elevation showing the parts in thepositions they occupy after one of the designation keys has beendepressed and after the machine has started to operate.

Fig. 9 is a partial right side elevation showing another species of theinvention.

Fig. 10 is a detailed plan view and section of the lock shown in Figs.5, 6, and 7.

The invention is shown applied to a calculating machine that has been onthe market for some time and which is known generally as the BurroughsPortable. This machine will be described very briefly, it beingunderstood, of course, that the invention can be applied to machines ofother types.

General calculating machine features The machine includes a plurality ofbanks of item keys (Fig. 3) which are depressed when an item is to beentered on the machine. After the keys are depressed, the machine isgiven a. stroke of operation by rocking a main drive shaft 11 clockwiseas viewed in Fig. 1 and then permitting it to return counter-clockwiseto normal under the influence of springs, these two movements beinggenerally referred to as the forward and the return stroke of operationof the machine. The drive shaft 11 may be rocked by means of a handle 12or by means of an electric motor (not shown), both forms )f drive beingold in the art. The drive shaft and its actuating device will bereferred to as the driving means of the machine and the parts to whichthe drive shaft is disconnectably connected will be referred togenerally as the operating mechanism of the machine. During the forwardstroke of the machine a stop bar 13 such as shown in Fig. 1 movesforward in each bank in which a key has been depressed until said barsare arrested by the stems of the depressed keys. These bars are attachedto and move pivoted actuator racks 14 and attached to these racks aretype bars 15. As the stop bars move forward they raise the type bars toproper position after which a printing mechanism 16 operates to printthe digit on a sheet of paper 17 that passes from a roll R around aplaten P. One or more registers 13 are employed for cooperation with theactuator racks for accumulating the items entered. The machine isprovided with the usual control keys at the right hand side as shown inFig. 3, that'is, the total key T, the sub total key ST, the non-add keyN A, the error key E, and the repeat key R.

Enforced designation feature provided toward the left hand side of themachine. These keys are similar to the item keys and associated withthem is a stop bar 13, an actuator rack 14, and a type bar of the sameconstruction as is employed with the item keys, except that thecharacters on the type bar, instead of being digits, are letters orwords such as oil, gas, tires. etc. Preferably the actuator racks forthe bank of designation keys is constructed so that the registers do notcooperate with it, but,

if desired, a portion of the register can be operated by this actuatorrack, such portion being beyond that part used by the item keys. \Vhenone of the designation keys 20 is depressed and the machine operated,the stop ar in the designation bank moves forward until arrested by thedepressed key which causes the type bar in the designation bank to beraised to position for printing a character corresponding to the keydepressed.

In the event an attempt is made to operate the machine underpredetermined conditions without depressing a designation key, thedriving means is automatically disconnected from the operating mechanismas the machine starts to operate.

Referring to Figs. 1, and 2. the bank of designation keys 20 isprovided, in addition to the usual key latch slide 21, with a slide 22extending through slots 23 in the stems of the keys. The slide 22 has aplurality of cam projections 24 on its upper edge positioned so that,when any of the keys 20 is depressed, the slide is moved forward. Theforward end of the slide has a jaw 25 formed on it which engages over aprojecting lug 26 on a yoke 27 pivoted on a shaft 28. This yoke has adownwardly extending lug 29 positioned between jaws on the end of onearm 30 of a bell crank yoke pivoted at 31. The other arm 32 of this bellcrank has a lateral lug 33 normally projecting into the path of a nose34 on a member 35 pivoted at 36.

The drive shaft 11 drives the machine through a disconnectibleconnection as follows:

Fixed to the drive shaft 11 is an arm 40 having a nose 41 locatedimmediately above a shoulder 42 on a pawl 43 pivoted at 44 to the fullstroke sector 45 that forms a part of the operating mechanism of themachine. As the drive shaft ll rocks clockwise (Fig. l) the nose 41 onarm 40 engages the shoulder 42 of pawl 43 and. tcnds to pull the fullstroke sector 45 around with the drive shaft to operate the machine. Themember 35 has a nose 46 projecting into the path of another shoulder 47on the pivoted pawl 43. Unless the nose 46 is removed from the path ofthe shoulder 47 said shoulder will engage the nose and the pawl 43 willbe rocked counterclockwise (Fig. l) on its pivot to disconnect the pawlfrom the nose 4 on the drive arm 40. This automatically disconnects theoperating mechanism of the machine from the driving means and thedriving means can continue to move but the machine will not be operated.instead the operating mechanism will be returned to normal by thesprings that urge it to normal position.

It will therefore be clear that, as long as no designation key isdepressed, the arm 32 of bell crank 3032 will block movement of member35 and the nose 46 will engage the shoulder 47 on pawl 43 toautomatically disconnect the operating mechanism from the driving meansas the machine starts to operate.

However, if one of the designation keys 20 is depressed, its slide 22will be moved forward which will rock the yoke 27 clockwise. This willrock the bell crank 3032 counterclockwise and remove the lateral lug 33from the path of the nose 34. The member 35 is then free to be rocked sothat its nose 46 is out of the path of the shoulder 47. The member 35 isrocked during normal operation of the machine as follows:

Referring to Fig. 4 the machine is provided with a slide 50 having ashoulder 51 normally engaging the face of a roller on a shaft 52 thatextends across the front of the machine and is carried by arms 53 ofwhich one is shown in Figs. 1 and 8, the arms being pivoted on the shaft28. The slide 50 is urged to the right as viewed in Fig. 4, by a spring54, but it is normally held in the position of Fig. 4 by a stud 55 on aplate 56 constituting a part of the operating mechanism of the machine.As the machine starts to operate, the plate 56 is rockedcounterclockwise (Fig. 4) which releases the slide 50 which is thereuponmoved to the right by its spring 54. This releases the shaft 52 which isthereupon rocked rearwardly by a spring 57. The arm 53 that supports theshaft 52 on the left hand side of the machine, viewing the machine fromthe front, has an arm 58 (Fig. 1) carrying a stud 59 operating in a slot60 in a member 35. As the shaft 52 rocks rearwardly the stud 59 moves inthe slot 60 and rocks the member 35 counterclockwise to move its nose 46from the path of the shoulder 47 on the pawl 43 prior to the time thatsaid shoulder reaches said nose. Accordingly, in normal operations ofthe machine, and when a designation key is depressed, the member 35 isrocked counterclockwise so that it will not cause an automaticdisconnection of the operating means from the driving means of themachine. on the other hand, if a designation key is not depressed, themember 35 cannot rock counterclockwise because it will be blocked by thelateral lug 33 on the arm 32, whereupon the driving means will beautomatically disconnected fom the operating mechanism.

One of the advantages of this construction is, that it quickly notifiesthe operator that he has not depressed a designation kdy. For example,if it is ahand operated machine, the handle will be freed for movementwithout any load as soon as the automatic disconnection takes place andhe will be instantly notified that the designation key has not beendepressed and that he has not operated the machine. He cannot connectthe driving means to the operating mechanism until he does depress thedesignation key. Another advantage is that it prevents operation of themachine with the machine in such a condition that the operator is liableto damage it. If the handle were blocked he would be liable to jerk orpull on it and might permanently injure the machine.

After severalitems have been entered and the proper designations printedopposite them, it is usually desirable to take a total. This total neednot necessarily have a designation character opposite it, in which eventthe enforced depression of a designation key would require an additionaloperation for no particular purpose except to release the machine.Accordingly, means is provided for automatically disabling the enforceddesignation feature when the total or sub-total keys are depressed.

Referring to Fig. 4, the bank of control keys is provided with a slidehaving two cam noses 71 and 72 cooperating with the stems of the totaland sub-total keys, but not with the other control keys. The forward endof this slide has a jaw 73 formed on it which engages'over a lateral lug74 on the yoke 27. When either the total or sub-total key is depressed,the slide 70 is moved forwardly which rocks the yoke 27 counterclockwiseas viewed in Fig. 4. This moves the bell crank 30-32 (Fig. 1)counterclockwise and releases the member 35 in the manner previouslydescribed. Accordingly, when either the total or sub-total key isdepressed, the machine is released for operation the same as if one ofthe designation keys had been depressed. In other words, the enforcedidentification feature is dis- 1L:zbled by depression of the total orsub-total ey. L00]: for controlling enforced designation feature It issometimes desirable to use the machine for calculations such as additionor subtraction without printing designating characters. Depression ofthe designation keys under these conditions would slow up thecalculating operations. To avoid this, provision is made for disablingthe enforced designation feature under the control of a lock so that theproprietor may lock the machine in the condition he wants it.

Referring to Fig. 4, the yoke 27 has a projection on one of its armspositioned-in the path of a lateral lug 81'on a downward ly extendingend of a slide 82. This slide has lateral projections 83 (Fig. 5)forming a fork straddling a vertical projection 84 on a slide 85 mountedon the keyboard. The slide 85 is controlled by a look by means of whichit may be locked, unlocked, and moved by a removable key 86. The exactform of the lock can be varied, but the following has been foundconvenient.

The key 86 is insertable into a rotatable barrel 87 (Fig. 4) mounted inthe keyboard. The key has three projections 88, 89 and 90 (Fig. 6)adapted to engage the edges of three pivoted tumblers 91, 92 and 93.Each of these tumblers has four recesses 94, 95, 96 and 9'? formed in itas shown in Fig. 7. When the lock is in its normal position as shown inFig. 5, the projection 84 on the slide 85 is in the notch 94 of each ofthe three tumblers. If the key 86 is inserted and turnedcounterclockwise as viewed in Fig. 5, the pivoted tumblers are rockedclockwise to their Fig. 7 position to free the projection 84 after whicha lug 98 (Fig. 6) on the key engages a notch 99 (Fig. 5) in the slide 85and moves the slide rearwardly. As the slide 85 moves rearwardly, theprojection 84 moves the slide 82 rearwardly which rocks the yoke 27counterclockwise as viewed in Fig. 4 or clockwise as viewed in Fig. 1.This results in rocking the bell crank 3032 counterclockwise (Fig. 1)which frees the member 35.

As the key 86 moves to its half turned position, the pivoted tumblersare permitted to return to their normal position under spring pressurewhereupon the projection 84 enters the notches 95 of the tumblers andthe slide 85 is locked in its rear position which locks the machine incondition for calculating operations without requiring depremion of theenforced designation keys. Of course, when the key 86 is turned in areverse direction the slide 85 is unlocked and moved forward again so asto restore the enforced designation feature.

This places the enforced identification feature under the control of theproprietor so that he can lock the machine in condition to be usedeither as a straight calculating machine or as a calculating machinethat requires the operator to depress a designation key before themachine can be operated.

Enforced designation of total only In some cases it may not be desiredto print a designating character opposite each item, but it may bedesired to print a designating character opposite each total. In orderthat this may be accomplished, anotherspecies of the invention has beenprovided which requires depression of one of the designation keys at thesame time that one of the total keys is depressed in order that themachine may be operated.

Referring to Fig. 9, when the total key T is depressed a lever 100 isrocked downward and when the sub-total key ST is depressed, a lever 101is rocked downward. Each of these levers causes a link mechanism 102 tomove downward. The lower end of this linkage mechanism has a lateral lug103 operating in a slot in an arm 104 pivoted at 105 to the side frameof the machine. The forward end of the arm 104, that is, the left-handend in Fig. 9, carries a pawl 106 pivoted at 107 to the lever 104 andurged counterclockwise by a spring 108 into engagement with a laterallimit lug 109 on the arm 104. The end of the pawl 106 is shaped toengage a stud 110 on the slide 50. \Vhen the parts are in normalposition, the pawl 106 occupies a position corresponding to the positionof the end of the arm 104 as shown in Fig. 4, that is, the end of thepawl is above the stud 110. When either the total or the sub-total keyis depressed, the arm 104 is swung downwardly and, except for mechanismhereafter described, the end of the pawl moves below the stud 110.

The pawl 106 carries a stud 111 which normally occupies a position abovethe up standing projection 112 on a link 113 connected at its forwardend to an arm 114 on a yoke 27. It will be recalled that this yoke isrocked counterclockwise as viewed in Fig. 9 when one of the designationkeys is depressed.

If no designation key is depressed, the upstanding end 112 of the link113 is directly under the stud 111 on the pawl 106 and, if at that time,the total or the sub-total key is depressed to rock the lever 104downwardly, the stud 111 on pawl 106 engages the end 112 of the slideand the end of the pawl is held in the path of the stud 110 on the slide50. This prevents rearward movement of the slide 50 as the machinestarts to operate. It will be recalled by referring to Fig. 4 that theforward end of the slide 50 has a shoulder 51 engaging aroller on theshaft :32 that extends across the machine and which normally rocksrearwardly as the machine operates. The rearward movement of this shaftis what moves the member 35 to move the nose 46- of the latter out ofthe path of the shoulder 47 on the trip pawl 43. If, however, the slide50 is prevented from moving rearwardly, the shaft 52 is prevented frommoving rearwardly and the member 35 will not be rocked, so that the trippawl 43 will 2e operated to automatically disconnect the driving meansfrom the operating mechanism of the machine. Accordingly, if nodesignation key is depressed at the time the total or sub-total key isdepressed, the machine cannot be operated to take a total because thedriving means will be disconnected from the, operating mechanism of themachine. 7

If. however, one of the designation keys is depressed, the yoke 27 willbe rocked counter lm-kwise (Fig. 9) which will move the link 113rearwardly so that the upstanding rear end 112 of the link will movebeyond the path of the stud 111 on the pawl 106. When this occurs, andif the total or sub-total key is depressed, the arm 104, in movingdownwardly, will move the pawl 106 below the stud 110 on the slide 50 sothat said slide is free to move rearwardly and the machine will operatein a normal manner to take a total.

This species thus automatically forces the operator to depress one ofthe designation keys when a total or a sub-total is taken and compelsthe printing of a character opposite the total or sub-total. If adesignation key is not depressed at the time a total key is depressed,the driving means of the machine is automatically disconnected from theoperating mechanism and the machine is not operated. At the same timethe operator is notified that he has not depressed a designation key.

It is to be understood that the structure shown is for purposes ofillustration only and that variations may be made in it with outdeparting from the spirit and scope of the invention as defined by theappended claims.

I claim:

1. A calculating machine havin an operating mechanism, a disconnectib edriving means normally connected thereto, printing mechanism forprinting digits, designation printing mechanism adapted to beconditioned to print characters adjacent said digits, and means actingto automatically disconnect said operating mechanism from said drivingmeans when an attempt is made to operate said machine to print digitswithout conditioning said designation printing means to printcharacters.

2. A calculating machine having an operating mechanism, a disconnectibledriving means normally connected thereto, amount keys upon which itemsmay be entered, a printing mechanism for printing said items, meansadapted to be conditioned to print designating characters opposite eachprinted item, and means operating to automatically disconnect theoperating mechanism from the driving means when an attempt is made tooperate the machine to print an item without conditioning said machineto print designating characters for said items.

3. A calculating machine having an operating mechanism, a disconnectibledriving means normally connected thereto, amount keys upon which itemsmay be entered, a printing mechanism for printing said items, a bank ofdesignation keys controlling a printing mechanism for printingdesignating characters opposite each printed item, and means controlledby said bank of designation keys operating to automatically disconnectthe operating mechanism from the driving means when an attempt is madeto operate the machine without depressing one of said designation keys.

4. A calculating machine having an operating mechanism, a disconnec'tibe driving means normally connected thereto, amount keys upon which itemsmay be entered, a printing mechanism for printing items entered on saidamount keys, a bank of designation keys, a printing mechanism controlledby said designation keys for printing characters, means operable toautomatically disconnect said operating mechanism from said drivingmeans, means normally disabling said automatic disconnecting means asthe machine starts to operate, and means controlled by said bank ofdesignation keys for preventing the disabling of said automaticdisconnecting means when an attempt is made to operate the machinewithout depressing one of said designation keys.

5. A calculating machine having an operating mechanism, a disconnectibledriving means normally connected thereto, amount keys upon which itemsmay be entered, printing mechanism for printing said items, means forprinting designating characters adjacent said printed items, meansacting to automatically disconnect said operating mechanisnr from saiddriving means when an attempt is made to operate said machine to printitems without conditioning the machine to print designating charactersopposite said items, and locking means for disabling the control of saidautomatic disconnecting means by said designation printing means.

6. A calculating machine having operating mechanism, a disconnectibledriving means normally connected thereto, amount keys upon which itemsmay be entered, printin mechanism for printing said items, a ban ofdesignation keys, printing mechanism controlled by said designation keysfor printing designating characters adjacent printed items, meanscontrolled by said designation keys for automatically disconnecting saidoperating mechanism from said driving means when an attempt is made tooperate said machine to print items when no designation key isdepressed, and key-controlled locking means for disabling the control ofsaid automatic disconnecting means by said designation keys.

7. A calculating machine having operating mechanism, a disconnectibledriving means normally connected thereto, amount keys upon which itemsmay be entered, printing mechanism for printin said items and the totalsthereof, total ta ing means, designating means adapted to be conditionedto cause said machine, when operated, to print designating characters,and means acting to automatically disconnect said operating mechanismfrom said driving means when an attempt is made to operate the machineto take a total without conditioning said designating means to print adesignating character.

8. A calculating machine having an operating mechanism, a disconnectibledriving means normally connected thereto, amount keys upon which itemsmay be entered, printing mechanism for printing said items and thetotals thereof, total taking means including a depressible total key, abank of depressible designation keys, printing mechanism controlled bysaid designation keys for printing designating characters, and meansacting to automatically disconnect said operating mechanism from saiddriving means when an attempt is made to operate said machine to take atotal when none of said designation keys are depressed.

9. A calculating machine having a driving means, disconnectible drivingconnections between said driving means and said machine, depressibleamount keys. printing mechanism for printing digits, designation keys,printing mechanism controlled by said designation keys for printingcharacters, a total taking means, means acting to automaticallydisconnect said machine from said driving means when an attempt is madeto operate said machine without a designation key depressed, and meanscontrolled by said total taking means acting to automatically disablesaid disconnecting means when said total taking means is conditioned fortotal taking.

10. A calculating machine having depressible amount keys, a printingmechanisnrt'or printing digits entered on said keys, designation keys,printing mechanism controlled by said designation keys for printingcharacters, means controlled by said designation keys requiringdepression of one of said designation keys at the time an amount key isdepressed in order to operate said machine, and a key controlled lockoperable to disable said designation-key-controlled means to therebylock the machine in condition to enable it to be used for calculatingpurposes independently of said designation keys.

11. A calculating machine having a driving means, disconnectible drivingconnections between said driving means and said machine, designationkeys, a printing mechanism controlled by said designation keys, a totaltaking means, means normally operable to disconnect said driving meansfrom said machine as the machine starts to operate, and meansconditioned by depression of one of said designation keys and said totalkey for moving said disconnecting means to inoperative position as themachine starts to operate.

12. A calculating machine having a driving means, disconnectible drivingconnections between said driving means and said machine, designationkeys, printing mechanism controlled by said designation keys, a totaltaking means including a depressible total key, means for automaticallydisconnecting said driving means from said machine as the machine startsto operate, means for disabling said disconnecting means as the machinestarts to operate, and means controlled by said designation keys andsaid total key preventing operation of said disabling means when onlysaid total key is depressed, but freeing said means for operation whenboth said total key and one of said designation keys are depressed.

13. A calculating machine having a driving means, disconnectibleconnections between said driving means and said machine, means fordisconnecting said connections, means normally operating at thebeginning of each operation of the machine to disable said disconnectingmeans, designation keys, total taking means, and mechanism under thejoint control of said designation keys and said total taking means forpreventing said disabling means from disabling said disconnecting meanswhen a designation key is depressed and said total taking means isconditioned for operation.

14. A calculating machine having a driving means, disconnectible drivingconnections between said driving means and said machine, depressibleamount keys, depressible designation keys having movable plates movableby depression of said designation keys, a printing mechanism controlledby said designation keys, means for disconnecting said driving meansfrom said machine, mechanism normally acting to automatically disablesaid disconnecting means as the machine starts to operate, a detent forpreventing movement of said disconnecting means, and means actuated bymovement of the movable plate for a designation key that is depressedacting to move said detent to release said disconnecting means when oneof said designation keys is depressed.

15. A calculating machine having a driving means, a movable pawlconnecting said driving means to said machine, a member for engagingsaid pawl as the machine starts to operate to move the pawl todisconnect the machine from said driving means, designation keys, andmechanism under the control of said designation keys for disabling saidmember when a designation key is depressed.

16. A calculating machine having a driving means, a movable pawlconnecting said driving means to said machine, a member for engagingsaid pawl as the machine starts to operate for moving said pawl todisconnect said machine from said driving means, means normally movingsaid member to disabled position as the machine starts to operate, adetent for preventing movement of said member, depressible designationkeys, a movable plate for said keys, and connections between saidmovable plate and detent for releasing said detent when one of saiddesignation keys is depressed.

17. A calculating machine having a driving means, disconnectibleconnections between said driving means and said machine, amount keysupon which items may be entered,-a total taking means including a totalkey, printing mechanism for printing the amount of said items and thetotals thereof, designation keys, printing mechanism controlled by saiddesignation keys for printing characters, and means under the jointcontrol of said designation keys and 1 said total key requiringdepression of a designation key when the total key is depressed in orderthat said connections may be conditioned so as not to automaticallydisconnect the driving means from the machine as operation of the latteris started.

18. A calculating machine having a driving means, disconnectibleconnections between said driving means and said machine, depressibleamount keys, a printing mechanism for printing digits entered on saidamount keys, designation keys, printing mechanism controlled by saiddesignation keys for printing characters, a total taking means, meansunder the joint control of said designation keys and said total takingmeans for controlling said disconnectible connections so as to requiredepression of a. designation key when said total taking means isconditioned for total taking in order for said connections to be able tooperate the machine when said driving means is operated, and a keycontrolled lock operable to disable the" control of said disconnectibleconnections by said designation keys and total taking means.

In testimonywhereof, I have subscribed my name.

ERNEST RACZ.

